.show-card-box {
  display: flex;
  padding: 10px;
  border: 1px solid #eee;
}

/* 向下箭头 */
.arrow-box {
  width: 300px;
  height: 200px;
  text-align: center;

}
.arrow-span {
  position: relative;
  display: inline-block;
  height: 100%;
  width: 1px;
  background-color: #000;
}

.arrow-span::after {
  position: absolute;
  bottom: -2px;
  left: -5px;
  content: ""; 
  border-left: 5px solid transparent;  
  border-right: 5px solid transparent;
  border-top: 10px solid black;  
}

/* 节点 */
.traffic-node {
  display: inline-block;
  padding: 5px 20px;
  border: 1px solid #000;
  border-radius: 16px;
}